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Anode material for secondary battery, anode for secondary battery and secondary battery therewithRelated Patent Categories: Chemistry: Electrical Current Producing Apparatus, Product, And Process, Current Producing Cell, Elements, Subcombinations And Compositions For Use Therewith And Adjuncts, Electrode, Chemically Specified Inorganic Electrochemically Active Material ContainingAnode material for secondary battery, anode for secondary battery and secondary battery therewith description/claimsThe Patent Description & Claims data below is from USPTO Patent Application 20070122700, Anode material for secondary battery, anode for secondary battery and secondary battery therewith. Brief Patent Description - Full Patent Description - Patent Application Claims
TECHNICAL FIELD [0001] This invention relates to an anode material for a secondary battery, an anode for a secondary battery and a secondary battery having the anode as a component. BACKGROUND ART [0002] As mobile terminals such as a cellular phone and a note-type personal computer have become widespread, a battery as their power source has become more important. Such a secondary battery must be small and light-weight While having a higher capacity and must exhibit a property that it is tolerant to degradation due to repetitive discharging and charging. [0003] Lithium metal is sometimes used as an anode for such a secondary battery in the light of its higher energy density and light weight. There is, however, a problem that as a charge/discharge cycle is repeated, needle crystals (dendrites) are precipitated on a lithium surface during charge, and these crystals penetrate a separator to cause internal short-circuit, leading to a reduced battery life. When using a carbon material such as graphite and hard carbon capable of occluding and releasing lithium ions as an anode, a discharge-charge cycle can be successfully repeated. However, a graphite material may have a smaller capacity than lithium metal or a lithium alloy and thus have a larger irreversible capacity during the initial charge/discharge, leading to a lower charge/discharge efficiency and thus to a smaller energy density. [0004] Recently, as a material for increasing an energy density, the use of Si as an anode activator has been investigated. It is believed that such an anode material may be used to provide a high capacity anode. An anode containing this type of Si exhibits a larger lithium occlusion/release amount per a unit volume and has a higher capacity. However, during occlusion or release of lithium ions, the electrode activator itself expands or shrinks, causing pulverization, and thus has a larger irreversible capacity during the initial-charge/discharge and a shorter charge/discharge cycle life. [0005] For preventing pulverization of an anode, there has been reported the use of an Si oxide as an activator (Patent document 1). In the report, there has been observed that an Si oxide can be used as an activator to improved cycle properties because of reduction in a cubic expansion/shrinkage per a unit weight of the activator. There has been, however, a problem that the oxide is less conductive and thus less electro-collecting, leading to a larger irreversible capacity. Patent document 1: Japanese Patent No. 2,997,741. DISCLOSURE OF INVENTION [0006] An objective of this invention is to provide a secondary battery exhibiting improved collection property, a higher charge/discharge efficiency in initial charge/discharge, a higher energy density and excellent cycle properties. [0007] The present invention is described below. This invention can provide a secondary battery exhibiting a higher charge/discharge efficiency in initial charge/discharge, a higher energy density and excellent cycle properties. [0008] [1] An anode material for a secondary battery which is used for an anode in a non-aqueous electrolyte secondary battery having at least the anode, a cathode and a lithium-ion conducting non-aqueous electrolyte, comprising an Si oxide and at least one noble metal. [0009] [2] The anode material for a secondary battery as described in [1], wherein when the Si oxide is expressed in SiO.sub.z, 0.8.ltoreq.z.ltoreq.2. [0010] [3] An anode material for a secondary battery which is used for an anode in a non-aqueous electrolyte secondary battery having at least the anode, a cathode and a lithium-ion conducting non-aqueous electrolyte, comprising a lithium silicate and at least one noble metal. [0011] [4] The anode material for a secondary battery as described in [3], wherein when the lithium silicate is expressed in Li.sub.xSiO.sub.y, 0<x and 0<y.ltoreq.4. [0012] [5] The anode material for a secondary battery as described in any of [1] to [4], further comprising lithium metal. [0013] [6] The anode material for a secondary battery as described in any of [1] to [5], wherein the noble metal is at least one metal selected from the group consisting of Pd, Ag, Pt, Au, Rh, Ir, Ru, Os and Re. [0014] [7] The anode material for a secondary battery as described in any of [1] to [6], wherein when a ratio of Si atoms to noble-metal atoms is expressed in a:b, 0.01<b/a. [0015] [8] The anode material for a secondary battery as described in any of [1] to [7], partially or wholly having an amorphous structure. [0016] [9] An anode for a secondary battery, comprising an activator layer having a film-structure anode activator which comprises the anode material for a secondary battery as described in any of [1] to [8] on at least one side of an anode collector. [0017] [10] The anode for a secondary battery as described in [9], wherein the activator layer is formed by a vacuum film-forming method. [0018] [11] The anode for a secondary battery as described in [10], wherein the vacuum film-forming method is CVD, vacuum deposition or sputtering. [0019] [12] An anode for a secondary battery, comprising an activator layer having a particulate-structure anode activator which comprises the anode material for a secondary battery as described in any of [1] to [8] on at least one side of an anode collector. [0020] [13] The anode for a secondary battery as described in [12], wherein the anode activator is formed by mechanical processing. Continue reading about Anode material for secondary battery, anode for secondary battery and secondary battery therewith... Full patent description for Anode material for secondary battery, anode for secondary battery and secondary battery therewith Brief Patent Description - Full Patent Description - Patent Application Claims Click on the above for other options relating to this Anode material for secondary battery, anode for secondary battery and secondary battery therewith patent application. ###  How KEYWORD MONITOR works... a FREE service from FreshPatents1. Sign up (takes 30 seconds). 2. Fill in the keywords to be monitored. 3. Each week you receive an email with patent applications related to your keywords. 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